Holly Township basement risk at a glance
| Basement Risk Index | 18 / 100 (LOWER) |
| Metro rank | #83 of 116 |
| Homes built before 1960 | 23% |
| Peak building era | 2000s (20% of homes) |
| Median year built | 1987 |
| Median home value | $213,800 |
| Median household income | $69,943 |
| Owner-occupied | 74% |
| Neighborhoods analyzed | 2 |
Holly Township's score is modeled from U.S. Census housing data; no municipal flood records are integrated yet. The Basement Risk Index is built from U.S. Census housing data and documented flood records. See our full methodology.
When Holly Township was built
The housing stock in Holly Township peaked in the 2000s, when about 20% of today's homes were built. In total, 23% of Holly Township homes predate 1960. That matters because basements built before the 1960s typically lack the sump pumps, perimeter drain tile, and backwater valves that became standard later, leaving many on their original, aging clay drain tiles.
How basement risk varies inside Holly Township
We score 2 individual neighborhoods inside Holly Township. Of those, 0 fall in the high or severe band, 0 are elevated, and 2 are moderate or lower. Risk is rarely uniform across a city, so the most useful number is the one for your own block.
What this means for Holly Township homeowners
Holly Township scores toward the lower end of the metro range, largely because of its newer housing. Risk is still real on clay soil, so watch for symptoms after heavy rain.
Why Holly Township homes face basement risk
Basement flooding in Holly Township is mostly a function of housing age and soil. Older homes were built with clay drain tiles that crack and clog over decades, and the dense clay across southeast Michigan holds water against foundations rather than letting it drain.
How Holly Township compares
Holly Township's Index of 18 is below the metro Detroit median of 36. It ranks #83 of 116 communities region-wide.
Does insurance cover it?
Often not. Standard Michigan homeowners policies commonly exclude sewer backup and groundwater unless you carry a specific endorsement. Before the next storm, it is worth reading our guide on whether insurance covers basement flooding in Michigan and checking your declarations page.
What to do about it
- Lower risk is not zero risk on the region's clay soil, a free prevention check takes about 30 minutes.
- Watch for symptoms after storms; what you see at your own home matters more than any average.
- Maintain gutters and grading, the two cheapest protections any Michigan home has.